Please help with a LSAT question

ninishine

Hi, could someone help me with following question?
In printableElsat test 4 section III 9#
9. The journalistic practice of fabricating remarks after an interview and printing them within quotation marks, as if they were the interviewee's own words, has been decried as a form of unfair. Misrepresentation. However, people's actual spoken remarks rarely convey their ideas as clearly as does a distillation of those ideas crafted, after an interview, by a skilled writer. Therefore, since this practice avoids the more serious misrepresentation that would occur if people's exact words were quoted but their defensible.

Which one of the following is a questionable technique used in the argument?

(A) answering an exaggerated charge by undermining the personal authority of those who made that charge .
(B) claiming that the prestige of a profession provides ample grounds for dismissing criticisms of that profession.
(C) Offering as an adequate defense of a practice an observation that discredits only one of several possible alternatives to that practice.
(D) concluding that a practice is right on the grounds that it is necessary.
(E) using the opponent's admission that a practice is sometimes appropriate as conclusive proof that that practice is never inappropriate.
the answer is C. could you explain why and how should I solve this kind of proble?

Thank you for your help